<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="2.css">
</head>
<body>
    <table>
        <thead>
            <tr>
                <td><input type="checkbox" id="jbAll"></td>
                <td>产品</td>
                <td>价格</td>
            </tr>
        </thead>
        <tbody>
        <tr>
            <td><input type="checkbox"></td>
            <td>iPhone8</td>
            <td>8000</td>
        </tr>
        <tr>
            <td><input type="checkbox"></td>
            <td>iPad pro</td>
            <td>5000</td>
        </tr>
        <tr>
            <td><input type="checkbox"></td>
            <td>iPad air</td>
            <td>2000</td>
        </tr>
        <tr>
            <td><input type="checkbox"></td>
            <td>Apple Watch</td>
            <td>2000</td>
        </tr>
        </tbody>
    </table>
    <script type="text/javascript" src="3.js"></script>
</body>
</html>